Camels have three eyelids to themselves from the blowing sand.A. protectB. stopC. keepD.

问题补充：

Camels have three eyelids to themselves from the blowing sand.

A. protect

B. stop

C. keep

D. hide

答案：

(答案→)A. protect

B. stop

C. keep

D. hide

解析：A考查动词。根据句意，骆驼有三个眼睑，以防止风沙进入眼睛。用protect“保护”，意在突出生理器官的功能。